Dynamo-electric machine.



F. B. HOWELL.- DYNAMO ELECTRIC MACHINE. APPLICATION FILED APR. 17, 1908.

905,81 7. Patented Dec. 1, 1908.

NH-N55155:; iNVENTUR M76351 FRED E- HnwgLL k b ATT'Y.

UNITED STATES PATENT oration.

'FRED B. HOWELL, OF SCHENEGTADY, NEW YORK, ASS IGNOR TO GENERAL ELEOTRIO COMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELEGTRIC MACHINE.

Specification of Letters Patent.-

' I Patented Dec. 1, 1908.

Application filed April 17, 1908. Serial a... 427,641.

To all whom it may concern:

Be it known that I, FRED B. HOWELL, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines, and more particularly to the construction of pole-pieces for such machines and has for its object a simple construction,- whereby the costof building such pole-pieces is cheapened.

My invention is particularly applicable to the commutating pole-pieces. These polepieces are usually very narrow, and it is therefore very difiieult to pass bars transversely through the laminae composing them and screw bolts into these bars to fasten the pole-pieces to the yoke of the machine.

My invention consists in extending the fastening bolts by which the'laminated poles are fastened to the frame of the machine, substantially all the way through the polepieces and making them of the same crosssection as the laminations themselves.

For a better understanding of my invention, however, reference may be had to the following description taken in connection with the accompanying drawing, in which Figure 1 is a view of a railway motor embodying my invention with parts broken away and in section to show the interior construction; Fig. '2 is an elevation of my pole-piece; Fig. 3 is a plan view of the polepiece of Fig. 2; Fig. 4 is a section on the line 4 =1 of Fig. 2; and Fig. 5 is av sectionon the line 5 5 of Fig. 2.

The railway motor shown is mounted on the car axle 2 and has a frame 1. The axle is geared to the motor shaft 3, the gears being contained in the gear case 4. The shaft 3 carries the armature 5 and commutator 6. Brush-holders 7 carry the current to the commutator and are bolted to, but insulatedfrom, the frame 1. End frame members also bolted to the frame carry the bear-.

tion, is built up of laminations 9 held between end-plates 10 by means of rivets 11.

The rivets are headed in the end members 10, which are of greater thickness thanthe laminations, and are preferably rounded so that the coil when placed in position encoun-' ters no sharp edges. The energizing coil 21 is shown as being wound in two portions, insulated from each other, the pole-piece and the frame. The pole-piece has a flange 12 at its outer end made of electrically conducting but non-magnetic material permanently secured in place. This flange is preferably formed of a brass ring cast in place about the end of the pole-piece and entering grooves or recesses 13 formed in the pole-piece, whereby displacement of the flange is prevented. The bolts 14 for fastening the pole-pieces to the frame have a head portion 15 which is of the same cross-section as the laminations 9, but are preferably constructed so as to leave transverse recesses 16 1n the pole face.

These recesses 16 are occupied by ribs 17 curely in place against the motor frame.

I desire it to be understood that my invention is not limited to the particular polepiece construction shown and described, and aim in the appended claims to cover all modifications which do not depart from the spirit of my invention.

v What I claim as new and desire to secure by Letters Patent of the United States, is,

1. A pole-piece for dynamo-electric machines, comprising laminations, fastening bolts therefor extending substantially all the way through the pole-piece, said bolts being of the same cross-section as the laminations, and means for fastening said laminations and bolts together. I

2. A pole-piece for dynamo-electric machines, comprising laminations, fastening bolts therefor extending substantially all the way through the pole-piece, said bolts being of the same cross-sectionas the laminations,

end members of greater thickness than the .laminations, and means for fastening said end members, laminations and bolts together.

3. A pole-piece or dynamo-electric machines, comprising; lamination's, fastening bolts therefor extending substantially all the Way through the pole-piece, said bolts being of the same cross-section as the laminations,

end members of greater thickness than the laminations, and rivets passing through the i laminations and bolts and headed in said end members. v

In witness whereof, I have hereunto set my hand this 16th day of April, 1908. FRED B. HOWELL.

YVitnesses':

BENJAMIN B. HULL, HELEN ORFORD. 

